Predicted to enable heparin binding activity. Predicted to be involved in positive regulation of Wnt signaling pathway. Predicted to act upstream of or within nail development. Predicted to be located in extracellular region. Is expressed in several structures, including embryo ectoderm; limb; lower urogenital tract; tooth; and urethra of male. Human ortholog(s) of this gene implicated in nonsyndromic congenital nail disorder 4. Orthologous to human RSPO4 (R-spondin 4). [provided by Alliance of Genome Resources, Apr 2022]